/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.pig.pigpen.view;

import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.Viewer;

public class ExampleContentProvider implements ITreeContentProvider {

    public Object[] getChildren(Object parentElement) {
        Object[] result = null;
        // if(parentElement instanceof DataContainer) {
        // DataContainer d = (DataContainer) parentElement;
        // result = d.getChildren();
        // } else if(parentElement instanceof PigVariable) {
        // PigVariable pv = (PigVariable)parentElement;
        // result = new Object[1];
        // result[0] = pv.getData();
        // } else if(parentElement instanceof ExampleData) {
        // result = ((ExampleData)parentElement).getChildren();
        // }
        result = ((IDataContainer) parentElement).getChildren();
        return result;

    }

    public Object getParent(Object element) {
        if (element instanceof DataContainer)
            return ((DataContainer) element).getParent();
        else if (element instanceof PigVariable)
            return ((PigVariable) element).getParent();
        else
            return null;
    }

    public boolean hasChildren(Object element) {
        // TODO Auto-generated method stub
        return (getChildren(element) == null) ? false : true;
    }

    public Object[] getElements(Object inputElement) {
        // TODO Auto-generated method stub
        return getChildren(inputElement);
    }

    public void dispose() {
        // TODO Auto-generated method stub

    }

    public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
        // TODO Auto-generated method stub

    }

}
